Honestly one of, if not the steamiest fanservice in the history of manga.
Wordless.
Attraction.
Scent.
Temptation.
Self-control.
Taste.
Suppression.
Angst.
Desire.
Very delicious elements for very sticky situation.
I doubt there’s even one otaku who has not fabricated a similar situation in the depths of the mind. Imagination brought to life.